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Council of Nicea
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Death of Constantine
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Council of Carthage condemns Donatists
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Pope Innocent I condemns Pelagianism
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Council of Chalcedon
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Anselm becomes Archbishop of Canterbury
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Peter Abelard condemned
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Council of Constance
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Augustine converts to Christianity
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Second Council of Nicea
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Olga of Russia converts to Christianity
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Christianity made official religion of Roman Empire
